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Chapter 1: Introduction to Physical Geology
Chapter 2: Atoms, Elements, and Minerals
Chapter 3: Igneous Rocks, Intrusive Activity, and the Origin of Igneous Rocks
Chapter 4: Volcanism and Extrusive Rocks
Chapter 5: Weathering and Soil
Chapter 6: Sediments and Sedimentary Rocks
Chapter 7: Metamorphism, Metamorphic Rocks, and Hydrothermal Rocks
Chapter 8: Time and Geology
Chapter 9: Mass Wasting
Chapter 10: Streams and Floods
Chapter 11: Ground Water
Chapter 12: Glaciers and Glaciation
Chapter 13: Deserts and Wind Action
Chapter 14: Waves, Beaches, and Coasts
Chapter 15: Geologic Structures
Chapter 16: Earthquakes
Chapter 17: The Earth's Interior
Chapter 18: The Sea Floor
Chapter 19: Plate Tectonics
Chapter 20: Mountain Belts and the Continental Crust
Chapter 21: Geologic Resources
Chapter 4: Volcanism and Extrusive Rocks
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Chapter Introduction
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Chapter Summary
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Student Study Guide Quiz
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Boxed Reading Summary
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Terms to Remember
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Expanding Your Knowledge
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Exploring Resources
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Interactive Quizzes
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Interacting with Journey Through Geology CD-ROM
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Journey Through Geology Web Quizzes
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Animations
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Learning Objectives
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Matching
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Chapter Activity
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Art Labeling Exercises
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Internet Exercises
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Chapter Web Sites
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Chapter Quizzes
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Expanding Your Knowledge
Chapter 4: Volcanism and Extrusive Rocks
What might explain the remarkable alignment of the Cascade volcanoes?
What would the present-day environmental effects be for an eruption such as that which created Crater Lake?
Why are there no active volcanoes in the eastern parts of the United States and Canada?
Why are continental igneous rocks richer in silica than oceanic igneous rocks?
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